The aftermath of the murder of Zahra Hussain Shahid, a senior leader of the political party, Pakistan Tehreek-e-Insaaf (PTI).—Images by Agencies

Activist of Tehreek-e-Insaf (PTI) gather in a protest against the killing of party leader Zahra Hussain in Karachi.—Photo by AFP

Pakistanis hold banners and chant slogans during a protest to condemn the killing of Zahra Shahid, a senior member of former Pakistani cricket star Imran Khan's Pakistan Tehreek-e-Insaf party.—Photo by AP

A Pakistani activist of Tehreek-e-Insaf (PTI) takes part of protest against the killing of party leader Zahra Hussain in Lahore.—Photo by AFP

Activist of Tehreek-e-Insaf (PTI) hold a candle during a protest against the killing of party leader Zahra Hussain, in Karachi.—Photo by AFP

Activists of Tehreek-e-Insaf (PTI) light candles in a protest against the killing of party leader Zahra Hussain, in KarachI.—Photo by AFP

A supporter of Pakistan's Muttahida Quami Movement (MQM) holds a dirt-stained T-shirt with an image of Imran Khan, leader of the Pakistan Tehreek-e-Insaf (PTI), during a protest against him in Karachi. Supporters of MQM took to the streets of Karachi on Monday to protest against Khan, who has accused it of killing one of his senior staff a week after a general election. MQM members denied responsibility for the killing while leaders have demanded a retraction from Khan. The writing in Urdu on the shirt reads, "New

Pakistani supporters of Muttahida Qaumi Movement (MQM) party, shout slogans during a protest against Imran Khan, the head of Pakistan Tehreek-e-Insaf (PTI) party, in Karachi.—Photo by AFP

Pakistani activists and supporters carry the coffin of Tehreek-e-Insaf (PTI) leader Zahra Hussain during her funeral ceremony in Karachi. Pakistani politician Imran Khan Sunday blamed a rival political leader for the killing of a senior member of his party, who was gunned down outside her home in the violence-plagued city of Karachi.—Photo by AFP

In this undated photo released by the Pakistan Tehreek-e-Insaf (PTI) party press office in Karachi, Zahra Shahid, center, a senior member of former Pakistani cricket star Imran Khan's Pakistan Tehreek-e-Insaf party in Sindh, poses with unidentified women at an unknown location in Pakistan. Police said gunmen on a motorcycle shot and killed Shahid outside her home, in the city of Karachi.—Photo by AP

Aleema Khan (C), sister of the leader of the Pakistan Tehreek-e-Insaf (PTI) political party Imran Khan, addresses supporters during a protest against the killing of Zahra Shahid Hussain, a leading member of the PTI, outside the mausoleum of Mohammad Ali Jinnah in Karachi.—Photo by Reuters